Vibration-proof vacuum-tube mounting



W. L. BETTS. VIBRATION PROOF VACUUM TUBE MOUNTING.

APPLICATION FILED AUG-I2. I919. I

Patented Jan. 11, 1921.

UNITED STATES PATENT FFIc WALTER L. wins, or BROOKLYN, NEW YORK, ASSIGNOR'TO WESTERN ELEcTRIc COMPANY, INCORPORATED, 015' NEW YORK, N. Y., A

max.

coRroRATIoN or NEW vIBRATIoN-rRoor vacuum-TUBE MOUNTING.

Patented Jan. 11, 1921.

Application filed August 12, 1919. Serial No. 317,092.

To all whom it may concern I 'Be it known that I, WALTER L. BETTs, a citizen of the United States, .residing at Brookl n, in the county of Kings, State of New Ybrk, have invented certain new and useful Improvements in Vibration-Proof Vacuum-Tube Mountings, of which the following is a full, clear, concise, and exact description.

This invention relates to supports for vacuum tubes, and moreparticularly to a support which will absorb substantially all vibrations. which would otherwise be impartedto the vacuum-tube from the structure on which it is mounted.

-In amplifier circuits particularly of the multi-stage type employing a number of vacuum tubes such as six or seven or more in cascade, it has been found that very minute vibrations of the electrodes of the first tubes produce variations in their output currents which when reamplified by the succeeding tubes are of such magnitude as to seriously interfere with, if not render impossible, the detection of the signals which are to be It is the object of this invention to provide' amounting for. one or more of the vacuum tubes in an arrangement of this kind which will absorb substantially all the vibrations which may occur in the main supporting structure.

In the form of the invention shown herein, the tube is mounted on a yielding member comprising two sheets of spon erubber connected by a metallic plate and t is yielding member is in turn mounted on a second yielding member comprising a sheet of sponge rubber at right angles to the first member and suitably attached at its ends to the main supporting structure.

This invention is an improvement on the vacuum tube supporting structure disclosed and broadly claimed in the application of Roy M. Allen, Serial No. 236,398, filed May 24,1918.

The above and other objects of the inven tion will be more clearly understood from perspective view, partly broken away, showthe following detailed description and claims taken in connection with the accompanying drawing, in which the figure is a ini one embodiment of the invention.

eferring to the drawing by reference numerals the base members 1 may rest upon or be secured to a casing or other structure n connection with which the vacuum tube 1s to be used. While the base members are shown in a horizontal position, it is, of course, obvious that they might be attached in any desired position. To theupper edges of these members 1 is attached a sheet of sponge rubber 2 by suitable securing means 3. Secured to the member 2 at a spaced interval from the base members are two yokeshaped members 4 and secured to each of the yoke members 4Iin a plane at right angles to member 2 is a sheet of sponge rubber 5, the sheets 5 lying in the same plane and being attached together-by the metallic plate 6 having an opening 7 therethrough.

Mounted adjacent the opening 7 is a clamping member 8 adapted to clamp the base of a vacuum tube 9. While the invention is of course not limited to use with any particular form of vacuum tube, the tube may, for example, United States patent to Harold DeForest Arnold, No. 1,129,942, dated March 2, 1915. It is, of course, obvious that any suitable or usual vacuum tube socket may be used in place of the clamping member 8. In the form shown, the leads 10 may be attached to the external electrodes of the .tube in any suitable manner as by soldering and the leads 10 are secured to the sheet of sponge rubber 2 by plates of insulating material 11. Leads should be used which are flexible and be of this type shown in so looped that a minimum of vibration is 'the equivalents thereof within the scope of the appended claims.

at is claimed is:

1. A vibration-proof vacuum-tube mounting comprising a .plurality of yielding members serially interposed between the tube and the supporting structure, one of said yielding members having its plane of most free movement at right angles to the plane of the most free movement of another of said members.

2. A vibration-proof mounting for vacuum tubes comprising a sheet of yield ng material, a second sheet of yielding materlal 4. A vibration-proof mounting for vacuum tubes comprising a sheet of yielding material attached at its ends to supporting means, a second sheet of yielding material secured to said first sheet at a substantial angle thereto, and means for securing said vacuum tube to saidsecond sheet.

5. A vibration-proof vacuum tube support comprising a sheet of yielding material attached at its ends to supporting means, a second sheet of yielding material secured to said first sheet at an angle thereto and intermediate the ends of said first sheet, and means for securing a vacuum tube to said second sheet.

6. A vibration-proof mounting for vacuum tubes comprising a sheet of sponge rubber su ported at its ends, a member secured to sai sheet at an angle thereto and com- .prising two sheets of sponge rubber connected by a rigid plate, and means for securmg a vacuum tube to said plate. 1

7. A vibration-proof mounting for vacuum tubes comprising a sheet of sponge rubber supported at its ends, a pair of yoke shaped supporting members s'ecuredto said sheet, a yielding member secured to said yoke-shaped member, and means for securing a yacuum tube to said yielding member. 8. A vibration-proof mounting for vacuum tubes, comprislng a supporting structure and a plurality of yielding members serially interposed'between the tube and said supporting structure, one of said members being adapted to absorb most efiiciently vibrations in one plane, and another of said members being adapted to absorb most efiiciently vibrations 1n another plane.

9. A vibration-proof mounting for vacuum tubes, comprising base members. a yielding member mounted on said base members, a support on said yielding member, a second yielding member connected to said support, and means for connecting a vacuum tube to said second yielding member.

In witness whereof, I hereunto subscribe my name this 8th day of August, A. D. 1919.

WALTER L."BETTS. 

